NewMamaMia, you have come to the right place. Although I don't know of other high needs babies in RL, you will find support from other mothers of high needs babies here, even those who babies are now older.
They fuss because of their personality. But the good news is that they get better and better with each milestone, sitting up, crawling, walking, talking. The more they can do, the happier they are. And as other easy babies start to become challenging toddlers, yours just gets easier. So hang in there.
Attachment parenting basically means going with the flow. Do what you need to keep baby happy, because boy does he let you know when he is unhappy. Forget about bad habits or makings rods for your own back. You have more immediate things to worry about. Co-sleeping, demand feeding, extended bf-ing, carrying around in slings, whatever it takes to get you through the day and keep baby on an even keel.
And don't feel guilty if your ds is still unhappy. Some babies are just like that, hth. My dd and ds are demanding, but they are also sparky, enthusiastic, cuddly and delightful, if also challenging. It will all become clearer when your ds is older. You won't want to exchange them then .